There is no specific medicine for specific treatment. Half of them need absolute braking in acute phase. No exercise. You can do other physical therapy at the same time. For example, hot compress and electric heating will help. If you don't get better or recover for a long time, it may lead to leg muscle atrophy. Then you can consider going to the hospital for piriformis resection. Not a major operation. Don't worry too much. I wish you a speedy recovery.